Splicing measuring method and system based on three-dimensional target

Abstract

The invention provides a splicing measuring method and system based on a three-dimensional target. The splicing measuring method comprises the following steps: (a) arranging two cameras in positions where a measured object can be observed, calibrating the parameters of the two cameras and setting a global coordinate system; (b) determining the coordinate value of a mark point on a three-dimensional target fixed on a vision sensor in a vision sensor coordinate system; (c) moving the vision sensor to the position where an area to be measured of the measured object can be measured, and carrying out three-dimensional measurement on the area to be measured of the measured object by using the vision sensor to obtain the three-dimensional data of the area to be measured of the measured object inthe vision sensor coordinate system; (d) determining the transformation relation between the vision sensor coordinate system in the current position and the global coordinate system; (e) transformingthe three-dimensional data obtained in the step (c) to the global coordinate system by using the transformation relation determined in the step (d); and (f) repeating the steps (c), (d) and (e) to complete the splicing of the three-dimensional measurement data of the measured object in the global coordinate system.

Description

technical field [0001] The invention relates to a splicing measurement method and system based on a three-dimensional target, belongs to the field of visual measurement, and is suitable for splicing measurement of large free-form surfaces. Background technique [0002] With the development of modern industry and the advancement of science and technology, the appearance of the measured object is becoming more and more complex, the requirements for the design and production cycle are getting shorter and shorter, and the requirements for processing and assembly precision are getting higher and higher. The need for 3D shape measurement. [0003] In recent years, in the three-dimensional measurement of large free-form surfaces, the visual method has become one of the most important measurement methods due to its advantages of non-contact, high speed, high precision, and easy automation. However, in actual measurement, due to the limited field of view of the visual sensor or the ...

AI Technical Summary

Problems solved by technology

[0005] At present, the commonly used splicing methods are: the splicing method based on the precision rotating platform, which not only requires high equipment accuracy, but also high system cost, small measurement range, and complicated operation; the splicing method based on marker points, which requires Pasting many marker points not only destroys the original surface data of the object, but also takes a long time to prepare in the early stage; the splicing method based on iterative corresponding points has a large amount of calculation, takes a long time, and is prone to cumulative errors

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